Roll forming has been widely used in many fields for its high efficiency, energy-saving, material-saving and other features, and the cost and forming precision are affected greatly by the reasonable design in mechanism and size of roll-forming machine. The model of uniform section roll forming machine was simplified equivalently, then this model was inputted into the ABAQUS for finite element analysis of forming process of sheet metal. The stress distributions of machine under the condition which was close to the actual production situation were obtained, then these important mechanisms of machine that bear load were checked, also the feasibility of design scheme and forming defect of sheet were studied. The results show that the numerical simulation can give a reasonable proof for the elastic deformation research of upper shaft and the selecting of bearings and other important parts; the proposal that using screws instead of stretching screw stem to bear load is feasible; and the 1200 MPa ultrahigh-strength steel sheet has obvious phenomenon of spring back and longitudinal bending during roll forming process, so over bending and rectify should be taken into.